[MacPorts] #73923: tcl9 fails to build on Leopard

[MacPorts]

#73923: tcl9 fails to build on Leopard
---------------------------+---------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.12.5
Resolution:                |   Keywords:  leopard
      Port:  tcl9          |
---------------------------+---------------------

Comment (by Dave-Allured):

 This patch from another port might have useful information.  I am not sure
 how to apply this.  It would be nice to not have to write a huge patch for
 all of those occurrences of `__builtin_unreachable`.

 https://github.com/macports/macports-
 ports/blob/master/devel/libunwind/files/0002-libunwind-Use-__builtin_trap-
 rather-than-__builtin_u.patch

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Ticket URL: <https://trac.macports.org/ticket/73923#comment:6>
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